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Priority to ES13449ApriorityCriticalpatent/ES13449A2/en
Publication of ES13449A2publicationCriticalpatent/ES13449A2/en
ES13449A1892-06-171892-06-17
Addendum to patent number 11172, issued 11/4/1890 for modifications in the wet treatment of copper ores.
ExpiredES13449A2
(en)